How likely will the device linx erode into the esophagus?

Rare...Here's a link: Common risks include: Difficulty swallowing (68%), Pain (24%), Stomach bloating (14%), Painful swallowing (8%), Hiccups (8%), Nausea (7%), Inability to belch or vomit (6%), Decreased Appetite (4%), Increased belching (2%), Flatulence (2%), Weight loss (2%), Vomiting (1%), Food impaction (1%), others. Ref http://www.surgery.usc.edu/uppergi-general/gastroesophagealrefluxdisease-linx-risksbenefits.html